Which Object is Closest in Length to a Micrometer?

AN ANT? The length of ants varies, but none is as small as a
micrometer. Pharaoh ants measure about 1 millimeter, whereas ponerine
ants, found in the tropics, are over 25 millimeters long. (A millimeter
is one-thousandth of a meter.)

THE DIAMETER OF A HUMAN HAIR? This measures 80-100 micrometers.
(A micrometer is one-millionth of a meter.)

A VIRUS? Viruses measure in the range 0.02-0.25 micrometers--closer
to a micrometer than the other items in this list.

Fact: Another name for micrometer is "micron."

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